From mboxrd@z Thu Jan 1 00:00:00 1970 From: u.kleine-koenig@pengutronix.de (Uwe =?iso-8859-1?Q?Kleine-K=F6nig?=) Date: Fri, 3 Feb 2012 10:35:18 +0100 Subject: [PATCH] Skip unnecessary pte makeup when clearing it. In-Reply-To: <4F2B903E.5070609@gmail.com> References: <1327912567-18966-1-git-send-email-bill4carson@gmail.com> <1327912567-18966-2-git-send-email-bill4carson@gmail.com> <20120203065432.GG25594@pengutronix.de> <4F2B903E.5070609@gmail.com> Message-ID: <20120203093518.GH25594@pengutronix.de> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Fri, Feb 03, 2012 at 03:43:58PM +0800, bill4carson wrote: > > > On 2012?02?03? 14:54, Uwe Kleine-K?nig wrote: > >Hello, > > > >On Mon, Jan 30, 2012 at 04:36:07PM +0800, bill4carson at gmail.com wrote: > >>From: Bill Carson > >> > >>If we are only about to clear a hardware pte entry, then pte makeup code is > >>unnecessary for cpu_v7_set_pte_ext and armv6_set_pte_ext, so just skip it. > >> > >>Signed-off-by: Bill Carson > >I havn't tested and I don't know if the patch brings any advantages like > >increased speed. But AFAICT it doesn't change the behaviour of > >armv6_set_pte_ext and cpu_v7_set_pte_ext. > > > Hi, Uwe > > I'm sorry I didn't state the purpose of this patch clearly. > As a matter of fact, it does change the behavior of set_pte_ext :) Depends on what you call behaviour (and it's not the 'u' you dropped that makes a difference :-). I meant that the side effects don't change. It's only that they are accomplished in a different (probably more effective) way. Best regards Uwe -- Pengutronix e.K. | Uwe Kleine-K?nig | Industrial Linux Solutions | http://www.pengutronix.de/ |